Physics of Atomic Nuclei最新文献

{"title":"Coulomb Interaction in Leptonic and Semileptonic Decays of Neutral ({B}) Mesons","authors":"S. I. Manukhov,&nbsp;N. V. Nikitin","doi":"10.1134/S1063778826600405","DOIUrl":"10.1134/S1063778826600405","url":null,"abstract":"<p>We present a comprehensive analysis of Coulomb final-state interactions in rare leptonic and semileptonic <span>(B)</span>-meson decays. Three approaches to Coulomb interaction were compared: the non-relativistic Gamow–Sommerfeld–Sakharov factor, the exact relativistic Crater–Alstine–Sazdjian factor, and the Furry picture. Coulomb corrections are calculated for leptonic (<span>(B_{d,s}toell^{+}ell^{-})</span>) and semileptonic (<span>(Bto{K^{0},pi^{0}}ell^{+}ell^{-})</span>, <span>(B_{s}to K^{0}ell^{+}ell^{-})</span>) channels, including differential branching ratios and angular distributions. For the <span>(B_{s}^{0}tomu^{+}mu^{-})</span> channel, these corrections increase the partial width prediction by 2<span>(%)</span>, improving consistency with LHCb/CMS measurements within current experimental (11<span>(%)</span>) and theoretical (5<span>(%)</span> lattice QCD) uncertainties. In <span>(Bto K^{0}mu^{+}mu^{-})</span> decays, Coulomb effects reduce theory-experiment discrepancies to less than <span>(1%)</span>, lying within the <span>(1sigma)</span> region of theoretical (11<span>(%)</span>) and experimental (10<span>(%)</span>) uncertainties. Finally, for semileptonic decays of <span>(B)</span>-mesons with <span>(tau)</span>-leptons, the Coulomb correction reaches 4<span>(%)</span>.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 2","pages":"241 - 248"},"PeriodicalIF":0.5,"publicationDate":"2026-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of Asymptotic Normalization Coefficients for the ({}^{16})O Nucleus in the ({}^{{12}}{text{C}}{+alpha}) Channel","authors":"L. D. Blokhintsev,&nbsp;D. A. Savin","doi":"10.1134/S1063778826600363","DOIUrl":"10.1134/S1063778826600363","url":null,"abstract":"<p>A new method was used to determine the asymptotic normalization coefficient <span>(C_{01})</span> for the <span>({}^{16}textrm{O}(0^{+};0text{ MeV})to{}^{12}textrm{C}+alpha)</span> channel, which plays an important role in nuclear astrophysics. <span>(C_{01})</span> was found from the solution of the Schrödinger equation for a system of two clusters <span>({}^{12})</span>C and <span>(alpha)</span>, interacting with each other via the Woods–Saxon potential plus the potential of a uniformly charged sphere. The parameters of the Woods–Saxon potential were chosen from the requirement that it leads to the experimental values of the binding energies of the ground <span>(0_{1}^{+})</span> and the first excited <span>(0_{2}^{+})</span> states of <span>({}^{16})</span>O. The value <span>(C_{01}=837{-}841)</span> fm<span>({}^{{-}1/2})</span> was obtained, which lies within a wide range of known values: <span>(13.9leq C_{01}leq 3390)</span> fm<span>({}^{{-}1/2})</span>. The asymptotic normalization coefficient <span>(C_{02})</span> for the <span>(0_{2}^{+})</span> state was also determined: <span>(C_{02}=1502{-}1532)</span> fm<span>({}^{{-}1/2})</span>.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 2","pages":"141 - 145"},"PeriodicalIF":0.5,"publicationDate":"2026-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and Creation of a Prototype Detector for the Observation of Neutrinoless Double Beta Decay of ({}^{{150}})Nd","authors":"A. V. Veresnikova,&nbsp;Z. A. Akhmatov,&nbsp;V. I. Gurentsov,&nbsp;A. M. Gangapshev,&nbsp;Z. Yu. Isupova,&nbsp;V. V. Kazalov,&nbsp;M. M. Kochkarov,&nbsp;G. Ya. Novikova,&nbsp;D. A. Tekueva,&nbsp;M. Sh. Tkhazaplizhev,&nbsp;S. A. Elcheparova,&nbsp;E. A. Yanovich","doi":"10.1134/S1063778826600338","DOIUrl":"10.1134/S1063778826600338","url":null,"abstract":"<p>The study details the development and testing of a scintillation detector prototype designed to investigate neutrinoless double beta decay in <span>({}^{150})</span>Nd. For this purpose, a liquid organic scintillator loaded with neodymium was formulated to serve as the active medium. The scintillator’s light yield and transmission properties were simulated, and a digital twin of the full experimental setup was developed to aid in its design. The prototype detector was subsequently assembled and installed in the low-background underground laboratory DULB-4900 at the BNO INR RAS. A series of calibrations were performed using radioactive sources, followed by an extended background data acquisition campaign lasting over 2000 hours. Analysis of the accumulated data allowed us to define the required radiopurity levels for the detector components, which is a critical prerequisite for achieving the target sensitivity in a future large-scale experiment.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 2","pages":"209 - 218"},"PeriodicalIF":0.5,"publicationDate":"2026-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Spin–Spin Dynamics of Glueballs","authors":"A. M. Badalian,&nbsp;M. S. Lukashov","doi":"10.1134/S1063778826600053","DOIUrl":"10.1134/S1063778826600053","url":null,"abstract":"<p>The masses of pure gauge glueballs are calculated with the use of relativistic string Hamiltonian without fitting parameters. The string tension <span>(sigma_{f}=0.184)</span> GeV<span>({}^{2})</span> in fundamental representation is fixed, using the Necco–Sommer lattice data, and to calculate the vector coupling <span>(alpha_{V}(r))</span> the value of <span>({Lambda}_{overline{MS}}^{0}=238)</span> MeV (<span>(N_{f}=0)</span>) is taken. The spin–spin potential, defined via the vacuum correlation function, is shown to produce a screening effect and decrease a hyperfine splittings between tensor and scalar glueballs. The masses of first and second <span>(0^{++})</span>, <span>(2^{++})</span> excitations are predicted. For the ground states the masses <span>(M(0^{++})=1508)</span> MeV, <span>(M(2^{++})=2292)</span> MeV (case A), in agreement with those of <span>(f_{0})</span>(1500), <span>(f_{2})</span>(2300) are obtained, and the first excitation mass <span>(M(0^{++})=2613)</span> MeV is predicted. In case B <span>(M(0^{++})=1.669)</span> MeV, <span>(M(2^{++})=2212)</span> MeV are obtained.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 1","pages":"114 - 120"},"PeriodicalIF":0.4,"publicationDate":"2026-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Search for High-Energy Gamma Sources Based on TAIGA-HiSCORE Data","authors":"L. G. Sveshnikova,&nbsp;I. I. Astapov,&nbsp;P. A. Bezyazeekov,&nbsp;A. V. Blinov,&nbsp;A. N. Borodin,&nbsp;E. A. Bonvech,&nbsp;N. M. Budnev,&nbsp;A. V. Bulan,&nbsp;P. V. Busygin,&nbsp;P. A. Volchugov,&nbsp;N. V. Volkov,&nbsp;D. M. Voronin,&nbsp;A. R. Gafarov,&nbsp;E. O. Gress,&nbsp;O. A. Gress,&nbsp;T. I. Gress,&nbsp;O. G. Grishin,&nbsp;A. Yu. Garmash,&nbsp;G. S. Goman,&nbsp;V. M. Grebenyuk,&nbsp;A. A. Grinyuk,&nbsp;A. N. Dyachok,&nbsp;D. P. Zhurov,&nbsp;A. V. Zagorodnikov,&nbsp;V. N. Zirakashvili,&nbsp;A. D. Ivanova,&nbsp;A. L. Ivanova,&nbsp;M. A. Iliushin,&nbsp;I. A. Kabannik,&nbsp;N. N. Kalmykov,&nbsp;V. V. Kindin,&nbsp;S. N. Kiryuhin,&nbsp;K. G. Kompaniets,&nbsp;E. E. Korosteleva,&nbsp;V. A. Kozhin,&nbsp;E. A. Kravchenko,&nbsp;A. P. Kryukov,&nbsp;L. A. Kuzmichev,&nbsp;A. Chiavassa,&nbsp;A. A. Lagutin,&nbsp;Yu. E. Lemeshev,&nbsp;B. K. Lubsandorzhiev,&nbsp;N. B. Lubsandorzhiev,&nbsp;A. D. Lukanov,&nbsp;S. D. Malakhov,&nbsp;R. R. Mirgazov,&nbsp;R. D. Monkhoev,&nbsp;E. A. Osipova,&nbsp;A. L. Pakhorukov,&nbsp;A. Pan,&nbsp;A. D. Panov,&nbsp;A. T. Panferova,&nbsp;L. V. Pankov,&nbsp;A. A. Petrukhin,&nbsp;D. A. Podgrudkov,&nbsp;I. A. Poddubny,&nbsp;V. A. Poleshchuk,&nbsp;E. G. Popova,&nbsp;E. B. Postnikov,&nbsp;V. V. Prosin,&nbsp;A. A. Pushnin,&nbsp;A. Yu. Razumov,&nbsp;R. I. Raikin,&nbsp;G. I. Rubtsov,&nbsp;E. V. Ryabov,&nbsp;V. S. Samoliga,&nbsp;I. Satyshev,&nbsp;A. A. Silaev,&nbsp;A. A. Silaev, Jr.,&nbsp;A. Yu. Sidorenkov,&nbsp;A. V. Skurikhin,&nbsp;A. V. Sokolov,&nbsp;V. A. Tabolenko,&nbsp;A. B. Tanaev,&nbsp;M. Yu. Ternovoy,&nbsp;N. A. Ushakov,&nbsp; Chernov,&nbsp;A. V. Shaikovsky,&nbsp;M. V. Shulga,&nbsp;I. I. Yashin","doi":"10.1134/S106377882660017X","DOIUrl":"10.1134/S106377882660017X","url":null,"abstract":"<p>This paper develops a method for searching for gamma rays from unknown sources against a complex astrophysical background based on data from the HiSCORE array in the TAIGA experiment. This task is divided into three stages: the development of criteria for distinguishing gamma rays from the main background particles; the selection of an assessment method and background smoothing; analysis of the statistical significance of a signal against the complex background. The first results of using this method are presented, and the reliability of detected gamma-ray sources with energies above 70 TeV is analyzed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 1","pages":"25 - 32"},"PeriodicalIF":0.4,"publicationDate":"2026-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single and Pair Production of Excited Top Quarks in Hadronic Collisions at ({sqrt{s}=13}) and ({14}) TeV","authors":"Eduard Boos,&nbsp;Viacheslav Bunichev,&nbsp;Sergei Trykov,&nbsp;Guliya Nurbakova,&nbsp;Saniya Rustembayeva","doi":"10.1134/S106377882660020X","DOIUrl":"10.1134/S106377882660020X","url":null,"abstract":"<p>We explore the collider phenomenology of spin-<span>(1/2)</span> excited top quarks arising from QCD-invariant magnetic transition operators, motivated by scenarios in which Standard Model fermions are composite objects. Assuming the absence of electroweak and contact interactions, we consider a minimal effective field theory framework where the excited top decays exclusively via the strong channel <span>(t^{*}to tg)</span>. Both pair and single excited top production are studied at proton–proton colliders with center-of-mass energies <span>(sqrt{s}=13)</span> and <span>(14)</span> TeV, corresponding to the LHC and HL-LHC regimes. We compute the total cross sections for both production modes, including all gauge and magnetic contributions, and examine their dependence on the compositeness scale <span>(Lambda)</span> and excited top mass <span>(m_{t^{*}})</span>. While pair production proceeds primarily through minimal QCD couplings and exhibits limited sensitivity to <span>(Lambda)</span>, single production is governed by the magnetic transition operator and provides a complementary probe with distinct kinematic features. Our results highlight the dominant role of single production across a wide region of parameter space, particularly in the natural scenario <span>(Lambda=m_{t^{*}})</span>, underscoring its relevance for future searches targeting excited top signatures with boosted topologies.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 1","pages":"62 - 68"},"PeriodicalIF":0.4,"publicationDate":"2026-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148010017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of the Cross Section of the ({e^{+}e^{-}to}) hadrons Reaction in the Energy Region ({sqrt{s}=1.8{-}2.00}) GeV with the SND Detector at the VEPP-2000 Collider","authors":"M. N. Achasov,&nbsp;K. I. Beloborodov,&nbsp;A. V. Berdyugin,&nbsp;A. G. Bogdanchikov,&nbsp;A. A. Botov,&nbsp;T. V. Dimova,&nbsp;V. P. Druzhinin,&nbsp;L. V. Kardapoltsev,&nbsp;A. G. Kharlamov,&nbsp;A. A. Korol,&nbsp;D. P. Kovrizhin,&nbsp;A. P. Kryukov,&nbsp;A. S. Kupich,&nbsp;N. A. Melnikova,&nbsp;N. Yu. Muchnoj,&nbsp;A. E. Obrazovsky,&nbsp;E. V. Pakhtusova,&nbsp;K. V. Pugachev,&nbsp;S. I. Serednyakov,&nbsp;Z. K. Silagadze,&nbsp;D. A. Shtol,&nbsp;I. K. Surin,&nbsp;V. N. Zhabin","doi":"10.1134/S1063778826600107","DOIUrl":"10.1134/S1063778826600107","url":null,"abstract":"<p>The inclusive cross section of <span>(e^{+}e^{-})</span>-annihilation to hadronic states with charged particles, excluding two-particle states is preliminary measured in this work. Measurement is done in the energy range 1.8–2.0 GeV in the center of mass system with the SND detector on VEPP-2000 collider. The total hadronic cross section is obtained by adding exclusive cross sections of <span>(e^{+}e^{-})</span>-annihilation to hadronic states with neutral particles only and states with two charged particles to the measured inclusive cross section. The resulting cross section is systematically greater than sum of exclusive cross sections, compatible with previous measurements of inclusive cross section and has much greater statistical accuracy.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 1","pages":"75 - 79"},"PeriodicalIF":0.4,"publicationDate":"2026-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148010018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of the Holographic Equation of State for Numerical Modeling of the Evolution of Quark–Gluon Plasma","authors":"Anton Anufriev,&nbsp;Vladimir Kovalenko","doi":"10.1134/S1063778826600077","DOIUrl":"10.1134/S1063778826600077","url":null,"abstract":"<p>In this paper, we propose a method for numerical modeling of the nuclear matter properties within the framework of relativistic heavy-ion collisions using a holographic equation of state. Model’s free parameters are calibrated using lattice results for quark masses approximating physical values and adjusted to match the Regge spectra of <span>(rho)</span> mesons. Numerical simulations are performed using the iEBE-MUSIC framework, which incorporates the MUSIC relativistic hydrodynamics solver. We modify the code by implementing a tabulated holographic equation of state, enabling simulations of quark–gluon plasma evolution with dynamically generated initial conditions via the 3D Monte Carlo Glauber Model. Finally, the spectra of produced hadrons are computed using a hybrid iSS <span>(+)</span> UrQMD approach at the freeze-out stage.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 1","pages":"95 - 100"},"PeriodicalIF":0.4,"publicationDate":"2026-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148010020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Expected Cascade Spectrum from Atmospheric Muons in the Baikal-GVD Neutrino Telescope","authors":"M. V. Lisitsin,&nbsp;R. V. Nikolaenko,&nbsp;A. A. Petrukhin,&nbsp;S. S. Khokhlov","doi":"10.1134/S1063778826600144","DOIUrl":"10.1134/S1063778826600144","url":null,"abstract":"<p>This paper presents the results of computer simulations and theoretical calculations of cascade showers generated by atmospheric muons in the Baikal-GVD neutrino telescope. Cascade spectra are required to estimate the background in the search for ultra-high-energy neutrinos and can be used to measure the atmospheric muon spectrum in the ultra-high-energy region.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 1","pages":"46 - 53"},"PeriodicalIF":0.4,"publicationDate":"2026-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Directed Flow of Deuterons in Xe ({+}) Cs(I) Collisions at ({E}_{mathbf{kin}}{=3.8A}) GeV at the BM@N Experiment","authors":"Irina Zhavoronkova,&nbsp;Mikhail Mamaev,&nbsp;Arkadiy Taranenko","doi":"10.1134/S1063778826600156","DOIUrl":"10.1134/S1063778826600156","url":null,"abstract":"<p>The Baryonic Matter at Nuclotron (BM@N) is the first experiment at the NICA accelerator complex designed to study the interactions of relativistic heavy ions in a range of high baryon densities. In this work, we present first results on the directed flow <span>(v_{1})</span> of deuterons in 10–30<span>(%)</span> central Xe <span>(+)</span> Cs(I) collisions at kinetic energy <span>(E_{textrm{kin}}=3.8A)</span> GeV, collected by the BM@N experiment during the first physics run in 2023. The results are compared with the existing world data on the deuteron <span>(v_{1})</span> in the energy range of several GeV.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"89 1","pages":"88 - 94"},"PeriodicalIF":0.4,"publicationDate":"2026-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148010019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}